/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.hadoop.tsfile;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.read.TsFileSequenceReader;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.write.TsFileWriter;
import org.apache.iotdb.tsfile.write.record.Tablet;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.apache.iotdb.tsfile.write.schema.Schema;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class TsFileHelper {

    private static final Logger logger = LoggerFactory.getLogger(TsFileHelper.class);

    public static boolean deleteTsFile(String filePath) {
        File file = new File(filePath);
        return file.delete();
    }

    public static void writeTsFile(String filePath) {

        try {
            File file = new File(filePath);

            if (file.exists()) {
                file.delete();
            }

            Schema schema = new Schema();

            List<MeasurementSchema> schemaList = new ArrayList<>();

            // the number of rows to include in the tablet
            int rowNum = 1000000;
            // the number of values to include in the tablet
            int sensorNum = 10;

            // add measurements into file schema (all with INT64 data type)
            for (int i = 0; i < 2; i++) {
                MeasurementSchema measurementSchema =
                        new MeasurementSchema(
                                Constant.SENSOR_PREFIX + (i + 1), TSDataType.INT64, TSEncoding.TS_2DIFF);
                schema.registerTimeseries(new Path(Constant.DEVICE_1), measurementSchema);
                schemaList.add(measurementSchema);
            }

            for (int i = 2; i < sensorNum; i++) {
                MeasurementSchema measurementSchema =
                        new MeasurementSchema(
                                Constant.SENSOR_PREFIX + (i + 1), TSDataType.DOUBLE, TSEncoding.TS_2DIFF);
                schema.registerTimeseries(new Path(Constant.DEVICE_1), measurementSchema);
                schemaList.add(measurementSchema);
            }

            // add measurements into TSFileWriter
            TsFileWriter tsFileWriter = new TsFileWriter(file, schema);

            // construct the tablet
            Tablet tablet = new Tablet(Constant.DEVICE_1, schemaList);

            long[] timestamps = tablet.timestamps;
            Object[] values = tablet.values;

            long timestamp = 1;
            long value = 1000000L;
            double doubleValue = 1.1;

            try {
                for (int r = 0; r < rowNum; r++, value++, doubleValue = doubleValue + 0.1) {
                    int row = tablet.rowSize++;
                    timestamps[row] = timestamp++;
                    for (int i = 0; i < 2; i++) {
                        long[] sensor = (long[]) values[i];
                        sensor[row] = value;
                    }
                    for (int i = 2; i < sensorNum; i++) {
                        double[] sensor = (double[]) values[i];
                        sensor[row] = doubleValue;
                    }
                    // write Tablet to TsFile
                    if (tablet.rowSize == tablet.getMaxRowNumber()) {
                        tsFileWriter.write(tablet);
                        tablet.reset();
                    }
                }
                // write Tablet to TsFile
                if (tablet.rowSize != 0) {
                    tsFileWriter.write(tablet);
                    tablet.reset();
                }
            } finally {
                tsFileWriter.close();
            }

        } catch (Throwable e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }

    public static void main(String[] args) throws IOException {
        String filePath = "example_mr.tsfile";
        File file = new File(filePath);
        if (file.exists()) {
            file.delete();
        }
        writeTsFile(filePath);
        try (TsFileSequenceReader reader = new TsFileSequenceReader(filePath)) {
            logger.info("Get file meta data: {}", reader.readFileMetadata());
        }
    }
}
